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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 887 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Round 31.46 to one decimal place. =
  2. 2.Which is closest to 1593 ÷ 19? (a) 800 (b) 160 (c) 80 (d) 40
  3. 3.Round 17.82 to one decimal place. =
  4. 4.Which is closest to 896 + 802 + 895? (a) 2500 (b) 2600 (c) 2800 (d) 2700
  5. 5.Which is closest to 395 + 497 + 600? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  6. 6.Which is closest to 1797 ÷ 19? (a) 45 (b) 900 (c) 180 (d) 90
  7. 7.Which is closest to 200 × 62? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  8. 8.Which is closest to 796 × 21? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  9. 9.Round 71393 to the nearest ten.
  10. 10.Which is closest to 397 + 305 + 395? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  11. 11.Round 86176 to the nearest thousand.
  12. 12.Round 43892 to the nearest ten.
  13. 13.Which is closest to 1007 ÷ 51? (a) 40 (b) 10 (c) 200 (d) 20
  14. 14.Which is closest to 696 + 504 + 295? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  15. 15.Which is closest to 1495 ÷ 31? (a) 50 (b) 25 (c) 500 (d) 100
  16. 16.Which is closest to 197 × 42? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  17. 17.Round 94120 to the nearest hundred.
  18. 18.Which is closest to 900 + 703 + 804? (a) 2600 (b) 2300 (c) 2400 (d) 2500
  19. 19.Which is closest to 297 + 398 + 97? (a) 800 (b) 700 (c) 900 (d) 1000
  20. 20.Round 47148 to the nearest thousand.
  21. 21.Which is closest to 902 × 22? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  22. 22.Which is closest to 896 + 801 + 900? (a) 2700 (b) 2500 (c) 2600 (d) 2800
  23. 23.Round 81526 to the nearest ten.
  24. 24.Which is closest to 603 ÷ 19? (a) 300 (b) 30 (c) 60 (d) 15
  25. 25.Which is closest to 2096 ÷ 29? (a) 700 (b) 35 (c) 140 (d) 70
  26. 26.Which is closest to 602 + 896 + 603? (a) 2100 (b) 2200 (c) 2000 (d) 2300
  27. 27.Round 85397 to the nearest thousand.
  28. 28.Round 2235 to the nearest thousand.
  29. 29.Round 97002 to the nearest thousand.
  30. 30.Which is closest to 697 × 62? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  31. 31.Which is closest to 802 ÷ 41? (a) 10 (b) 40 (c) 20 (d) 200
  32. 32.Which is closest to 204 + 97 + 795? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  33. 33.Which is closest to 903 + 897 + 402? (a) 2100 (b) 2200 (c) 2300 (d) 2400
  34. 34.Round 42556 to the nearest hundred.
  35. 35.Which is closest to 497 × 31? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  36. 36.Round 49169 to the nearest hundred.
  37. 37.Round 55.79 to one decimal place. =
  38. 38.Which is closest to 302 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000
  39. 39.Which is closest to 402 + 805 + 400? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  40. 40.Round 43.86 to one decimal place. =

Answer key

  1. 31.5
  2. 80
  3. 17.8
  4. 2600
  5. 1500
  6. 90
  7. 12000
  8. 16000
  9. 71390
  10. 1100
  11. 86000
  12. 43890
  13. 20
  14. 1500
  15. 50
  16. 8000
  17. 94100
  18. 2400
  19. 800
  20. 47000
  21. 18000
  22. 2600
  23. 81530
  24. 30
  25. 70
  26. 2100
  27. 85000
  28. 2000
  29. 97000
  30. 42000
  31. 20
  32. 1100
  33. 2200
  34. 42600
  35. 15000
  36. 49200
  37. 55.8
  38. 6000
  39. 1600
  40. 43.9

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